Johnny is a disambiguation. It may refer to:
- Johnny Elaine - A realistic fish head seen in the "SpongeBob SquarePants Theme Song" and occasionally in some episodes.
- Big Johnny - One of Billy's friends in the episode "Friend or Foe."
- Johnny Krill - A krill who appears in the episode "Extreme Spots."
- Johnny - A fish seen in "It's a SpongeBob Christmas!."